I noticed mine did that a couple years ago, except mine was even worse. So I reached down and grabbed the inside of the frame and squeezed, and the frame just crumbled in my hand. Needless to say I had to get a new frame. I hope yours isn't as bad as mine was, but definitely check the whole frame.
92 YJ, 4.0, 5" BDS springs, 1" booms, 1" BL, 35x12.50x15 MTZ's, Ford 8.8 with LSD, 4.10 gears. It's never done though.
If it is bad there you probably have bigger problems. Take a screwdriver and start poking at the frame around the rear shackle mounts, by the skid plate, and up front by the steering box. Those are the usual spots that go first. You may be looking for a frame.
My 90 is Rust free in Louisiana but I don't live on the Coast. You say Welding to do, I'm not sure you have any thing to weld, sorry man get a used frame thats rust free for $400 to $600 and change it all over, Then you know you and you family or safe, and mine to if were on the same road, good luck.
The Government can not give anything to anybody that it does not first take from someone else !
I'm not even going to bother with this garbage jeep anymore. Selling it dirt cheap and finding something different. It's been like this for as long as I have owned it and I have off roaded it so I'm not worried about it
1992 Jeep Wrangler YJ 2.5L 5 speed. -it may be stock but it still rocks off-road!